Miniature optical readhead for optical diagnostic device

Abstract

A miniature readhead for a photometric diagnostic instrument includes a housing of hand-held form factor, configured for receiving reagent sample media therein. The sample media has a plurality of test areas configured to react with, and change color, according to an amount of an analyte in a sample. The holder is sized and shaped for forming an indexed fit with the sample media and includes an array of light sources coupled to the housing, each of the light sources configured to emit light onto a respective one of the test areas. An array of chambers respectively containing an array of light detectors, is configured to enable each of the light detectors to receive diffuse, non-specular reflections of the light from the test areas, while substantially preventing the light detectors from receiving specular reflections of the light.

Description

RELATED APPLICATIONS [0001] This application is a Continuation-In-Part of co-pending P.C.T. Patent Application No. US05 / 07227, designating the United States, entitled Handheld Optical Diagnostic Device Having Image System Array, filed Mar. 3, 2005, which claims priority to U.S. Provisional Patent Application Ser. No. 60 / 550,811, entitled Handheld Optical Diagnostic Device Having Image System Array, filed on Mar. 5, 2004.BACKGROUND [0002] 1. Technical Field [0003] The present invention generally relates to the field of clinical chemistry. More particularly, the present invention relates to a readhead for an optical diagnostic system that analyzes the color change associated with one or more test areas on sample media following contact thereof with a liquid specimen, such as urine or blood. [0004] 2. Background Information [0005] Throughout this application, various patents are referred to by an identifying citation. The disclosures of the patents referenced in this application are he...

AI Technical Summary

Benefits of technology

[0015] A further aspect of the invention includes a method for reading reagent sample media, the sample media having a plurality of test areas disposed in spaced relation thereon, each of the test areas configured to react with a sample when disposed in contact with the sample and to change color according to an amount of an analyte in the sample. The method includes receiving the sample media into a sample holder of a readhead of a photometric diagnostic device, the readhead having a hand-held form factor, and the sample holder configured to maintain the sample media in an indexed fit therewith. Light is sequentially emitted onto a respective one of the test areas, and diffuse, non-specular reflectances of the test areas are sequentially captured with respective ones of an array of light or color detectors. Specular reflections of the light are prevented from reaching the array of light or color detectors. The color of the non-specular reflectances is determined, to derive the amount of constituent or property in the sample. An output signal is then generated, which corresponds to the amount of the constituent or property.

Problems solved by technology

Color comparisons made with the naked eye can lead to imprecise measurement.

A common aspect of these instruments is that their relative size and complexity, particularly with respect to those utilizing automated test pad transport systems, render them relatively bulky and difficult to transport.

Unfortunately, such aggregation of samples from multiple patients presents opportunities for error due to mislabeling of the samples and / or the test results.

Moreover, in many instances, the time required for transporting the samples to and from the processing center, and for testing and recording the results, may be problematic.

This device, however, relies on relatively complex imaging technology.

Moreover, even with the relative simplicities inherent with such single analyte testing environments, these devices tend to utilize relatively complex readhead systems that may be labor intensive to manufacture.

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